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NVL

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

The NVL() function (or also the ISNULL() or IFNULL() functions) produces the first argument if it is NOT NULL, otherwise the second argument. It is a special case of the COALESCE function, which takes any number of arguments.

SELECT nvl(null, 1);
create.select(nvl(null, 1)).fetch();

The result being

+-----+
| nvl |
+-----+
|   1 |
+-----+

Dialect support

This example using jOOQ:

nvl(null, 1)

Translates to the following dialect specific expressions:

Access

iif(NULL IS NULL, 1, NULL)

ASE, Aurora Postgres, CockroachDB, DuckDB, Exasol, Firebird, Hana, Postgres, Redshift, SQLDataWarehouse, SQLServer, Snowflake, Sybase, Teradata, Trino, Vertica, YugabyteDB

coalesce(
  NULL,
  1
)

Aurora MySQL, BigQuery, MariaDB, MemSQL, MySQL, SQLite

ifnull(
  NULL,
  1
)

DB2, H2, HSQLDB, Informix, Oracle

nvl(
  NULL,
  1
)

Derby

coalesce(
  ?,
  1
)

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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